Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Low voltage and oscillation
#7

Thanks Chas
Sorry I didn't answer the questions in your first post but frustration took over and I walked away for a little while.  The transformer does not have any shorts.  I had the radio on for more than an hour while checking voltages and poking around and the tran. got a little over room temp.  Warm to the touch.
 There is no Candohm in this radio and I'm still not sure how to check if a cap or resistor is leaking to chassis.  Something I have still got to learn.
After checking voltages with my vtvm,( which is an Eico 232)it was a little higher but still below the specified voltage.  Recommended 180 v dc plate voltage and with the vtvm I got 156 v.  This difference was consistent thru the set.  I also have a Fluke with 1000ohm/volt.
 I obtained a 40-180 chassis which is similar to the 40-190. I checked my wiring and the installation of components to it and they all seem right.  The only thing changed in the -180 were the Ecaps and 2 wax caps.
  As far as checking the grounding everything is riveted as far as chassis grounds.  I went thru and tried to get a connection on all the ground rivets with a screwdriver while the set was on and got nothing.
  So my next test is to check my current consumption on the B circuit using your guidelines.
  My prowess is waning along with my confidence but I'll keep trying.

Thanks again
Dick


Messages In This Thread
Low voltage and oscillation - by madsowry - 03-11-2019, 07:01 PM
RE: Low voltage and oscillation - by morzh - 03-11-2019, 08:52 PM
RE: Low voltage and oscillation - by madsowry - 03-11-2019, 10:42 PM
RE: Low voltage and oscillation - by Chas - 03-12-2019, 11:58 AM
RE: Low voltage and oscillation - by madsowry - 03-12-2019, 05:26 PM
RE: Low voltage and oscillation - by Chas - 03-12-2019, 06:08 PM
RE: Low voltage and oscillation - by madsowry - 03-12-2019, 11:14 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently 1728 online users. [Complete List]
» 1 Member(s) | 1727 Guest(s)
Avatar

>